.577 Tyrannosaur
The .577 Tyrannosaur is a proprietary cartridge developed by A-Square in 1993. It is an entirely new design, not based on any previous cartridge for the hunting of large game in Africa. The .577 contains a 750 Grain Monolithic Solid Projectile which when fired moves at 2460fps producing 10,180 or more foot pounds of energy.
For comparison the .223 Remington/Nato 5.56mm round used in weapons such as the M16 rifle, when using a 77 Grain projectile, moves at 2750 ft/s(~838 m/s) producing 1293 ft·lbf(~1758 J).
วีดีโอทดลองยิง
http://www.youtube.com/watch?v=CQJSZs-euZU
ข้อมูลเพิ่มเติม
http://www.accuratereloading.com/577tyr.html 
